aFe Power Silver Bullet 46-31004 BMW M3 (E36) Throttle Body Spacer In-house dyno testing resulted in max gains up to +4 HP and +8 lbs. x ft. of torque Precision machined from 6061-T6 billet aluminum Serrated/Helix Combination Design for optimum airflow into the combustion chamber Includes all hardware This product is 50-state legal (CARB E.O Number D-550-11)